diff --git a/examples/src/bin/gtksink.rs b/examples/src/bin/gtksink.rs
index 78eeee8ac..3ce7e6bee 100644
--- a/examples/src/bin/gtksink.rs
+++ b/examples/src/bin/gtksink.rs
@@ -61,7 +61,7 @@ fn create_ui(app: &gtk::Application) {
         let pipeline = &pipeline_clone;
         let position = pipeline
             .query_position::<gst::ClockTime>()
-            .unwrap_or(0.into());
+            .unwrap_or_else(|| 0.into());
         label.set_text(&format!("Position: {:.0}", position));
 
         glib::Continue(true)
diff --git a/examples/src/bin/gtkvideooverlay.rs b/examples/src/bin/gtkvideooverlay.rs
index 38db9d91a..b28c1ccea 100644
--- a/examples/src/bin/gtkvideooverlay.rs
+++ b/examples/src/bin/gtkvideooverlay.rs
@@ -131,7 +131,7 @@ fn create_ui(app: &gtk::Application) {
         let pipeline = &pipeline_clone;
         let position = pipeline
             .query_position::<gst::ClockTime>()
-            .unwrap_or(0.into());
+            .unwrap_or_else(|| 0.into());
         label.set_text(&format!("Position: {:.0}", position));
 
         glib::Continue(true)
diff --git a/gstreamer-app/src/app_src.rs b/gstreamer-app/src/app_src.rs
index 1ab72359a..e87b9fb36 100644
--- a/gstreamer-app/src/app_src.rs
+++ b/gstreamer-app/src/app_src.rs
@@ -44,16 +44,6 @@ pub struct AppSrcCallbacksBuilder {
 }
 
 impl AppSrcCallbacksBuilder {
-    pub fn new() -> Self {
-        skip_assert_initialized!();
-
-        AppSrcCallbacksBuilder {
-            need_data: None,
-            enough_data: None,
-            seek_data: None,
-        }
-    }
-
     pub fn need_data<F: Fn(&AppSrc, u32) + Send + Sync + 'static>(self, need_data: F) -> Self {
         Self {
             need_data: Some(Box::new(need_data)),
diff --git a/gstreamer/src/iterator.rs b/gstreamer/src/iterator.rs
index f0272a6ee..cb584f43a 100644
--- a/gstreamer/src/iterator.rs
+++ b/gstreamer/src/iterator.rs
@@ -85,13 +85,11 @@ where
                 Arc::into_raw(Arc::new(func_box)) as gpointer,
             );
 
-            let it = from_glib_full(ffi::gst_iterator_filter(
+            from_glib_full(ffi::gst_iterator_filter(
                 it as *mut _,
                 Some(filter_trampoline::<T>),
                 closure_value.to_glib_none().0,
-            ));
-
-            it
+            ))
         }
     }
 
diff --git a/gstreamer/src/message.rs b/gstreamer/src/message.rs
index fd310ae72..8f0f714db 100644
--- a/gstreamer/src/message.rs
+++ b/gstreamer/src/message.rs
@@ -323,7 +323,7 @@ impl GstRc<MessageRef> {
     }
 
     #[cfg(any(feature = "v1_10", feature = "dox"))]
-    pub fn new_property_notify<'a>(property_name: &'a str) -> PropertyNotifyBuilder<'a> {
+    pub fn new_property_notify(property_name: &str) -> PropertyNotifyBuilder {
         assert_initialized_main_thread!();
         PropertyNotifyBuilder::new(property_name)
     }
@@ -341,7 +341,7 @@ impl GstRc<MessageRef> {
     }
 
     #[cfg(any(feature = "v1_10", feature = "dox"))]
-    pub fn new_redirect<'a>(location: &'a str) -> RedirectBuilder<'a> {
+    pub fn new_redirect(location: &str) -> RedirectBuilder {
         assert_initialized_main_thread!();
         RedirectBuilder::new(location)
     }
diff --git a/gstreamer/src/stream_collection.rs b/gstreamer/src/stream_collection.rs
index ce8ab520b..584bdda95 100644
--- a/gstreamer/src/stream_collection.rs
+++ b/gstreamer/src/stream_collection.rs
@@ -72,4 +72,8 @@ impl StreamCollection {
     pub fn len(&self) -> usize {
         self.get_size() as usize
     }
+
+    pub fn is_empty(&self) -> bool {
+        self.len() == 0
+    }
 }
diff --git a/tutorials/src/bin/basic-tutorial-5.rs b/tutorials/src/bin/basic-tutorial-5.rs
index bb165aa5d..25170eaaf 100644
--- a/tutorials/src/bin/basic-tutorial-5.rs
+++ b/tutorials/src/bin/basic-tutorial-5.rs
@@ -263,7 +263,7 @@ mod tutorial5 {
     // thread of this event through a message in the bus
     fn post_app_message(playbin: &gst::Element) {
         let mbuilder = gst::Message::new_application(gst::Structure::new_empty("tags-changed"));
-        playbin.post_message(&mbuilder.build());
+        let _ = playbin.post_message(&mbuilder.build());
     }
 
     pub fn run() {
diff --git a/tutorials/src/bin/basic-tutorial-8.rs b/tutorials/src/bin/basic-tutorial-8.rs
index 2ecbad6c6..847815a05 100644
--- a/tutorials/src/bin/basic-tutorial-8.rs
+++ b/tutorials/src/bin/basic-tutorial-8.rs
@@ -13,7 +13,7 @@ extern crate glib;
 use glib::source::SourceId;
 
 const CHUNK_SIZE: usize = 1024; // Amount of bytes we are sending in each buffer
-const SAMPLE_RATE: u32 = 44100; // Samples per second we are sending
+const SAMPLE_RATE: u32 = 44_100; // Samples per second we are sending
 
 #[derive(Debug)]
 struct CustomData {