diff --git a/ext/QuantumCliffordGPUExt/fastmemlayout.jl b/ext/QuantumCliffordGPUExt/fastmemlayout.jl
index f5706b641..490903ef9 100644
--- a/ext/QuantumCliffordGPUExt/fastmemlayout.jl
+++ b/ext/QuantumCliffordGPUExt/fastmemlayout.jl
@@ -8,7 +8,7 @@ TableauAdj is the type of Tableau with its data stored in an adjoint of a CUDA a
 rest of the fastrow, fastcolumn functions are implemented in QuantumClifford.jl
 """
 
-# todo when we use to_gpu, to_cpu the efffect of fastrow, fastcolumn disappears
+# todo when we use to_gpu, to_cpu the effect of fastrow, fastcolumn disappears
 fastrow(t::TableauCUDA) = t
 fastrow(t::TableauAdj) = Tableau(t.phases, t.nqubits, CuArray(t.xzs))
 fastcolumn(t::TableauCUDA) = Tableau(t.phases, t.nqubits, CuArray(t.xzs')')
diff --git a/src/ecc/codes/concat.jl b/src/ecc/codes/concat.jl
index 0bd8f627b..1304f36ea 100644
--- a/src/ecc/codes/concat.jl
+++ b/src/ecc/codes/concat.jl
@@ -25,7 +25,7 @@ function parity_checks(c::Concat)
     phases_logx₁ = phases(logx_ops(c₁))
     h_logz₁ = stab_to_gf2(logz_ops(c₁))
     phases_logz₁ = phases(logz_ops(c₁))
-    # parity checks of c₂ with qubits repalced with logical qubits of c₁
+    # parity checks of c₂ with qubits replaced with logical qubits of c₁
     outer_check_h = transpose(hcat([vcat(
         kron(h₂[i, 1:end÷2], h_logx₁[j, 1:end÷2]) .⊻ kron(h₂[i, end÷2+1:end], h_logz₁[j, 1:end÷2]), # X part
         kron(h₂[i, 1:end÷2], h_logx₁[j, end÷2+1:end]) .⊻ kron(h₂[i, end÷2+1:end], h_logz₁[j, end÷2+1:end]) # Z part
diff --git a/src/noise.jl b/src/noise.jl
index 226a77780..7283afa90 100644
--- a/src/noise.jl
+++ b/src/noise.jl
@@ -208,3 +208,11 @@ function applybranches(s::AbstractQCState, g::NoisyGate; max_order=1)
     news, _,_,_ = applybranches(s,g.gate,max_order=max_order)[1] # TODO this assumes only one always successful branch for the gate
     return [(state, continue_stat, prob, order) for (state, prob, order) in applynoise_branches(news, g.noise, affectedqubits(g), max_order=max_order)]
 end
+
+function _sentinel_affectedqubits end
+QuantumClifford._sentinel_affectedqubits(x::Any) = QuantumClifford.affectedqubits(x)
+QuantumClifford._sentinel_affectedqubits(::QuantumClifford.NoiseOpAll) = missing
+
+function _sentinel_maximum end
+QuantumClifford._sentinel_maximum(x::Any) = maximum(x)
+QuantumClifford._sentinel_maximum(::Missing) = 0
\ No newline at end of file
diff --git a/src/petrajectory.jl b/src/petrajectory.jl
index 125ecc30e..fb58b949d 100644
--- a/src/petrajectory.jl
+++ b/src/petrajectory.jl
@@ -70,6 +70,11 @@ end
 
 See also: [`pftrajectories`](@ref), [`mctrajectories`](@ref)"""
 function petrajectories(initialstate, circuit; branch_weight=1.0, max_order=1, keepstates::Bool=false)
+    for circuit_op in circuit
+        if(_sentinel_maximum(_sentinel_affectedqubits(circuit_op)) > nqubits(initialstate))
+            throw(ArgumentError(lazy"""Qubit out of bounds for $circuit_op. Attempting to access a $(nqubits(initialstate)) qubit state at index $(_sentinel_maximum(_sentinel_affectedqubits(circuit_op)))"""))
+        end
+    end
     if keepstates
         return petrajectory_keep(initialstate, circuit; branch_weight=branch_weight, current_order=0, max_order=max_order)
     else
diff --git a/src/randoms.jl b/src/randoms.jl
index b1150a0a4..b45c28018 100644
--- a/src/randoms.jl
+++ b/src/randoms.jl
@@ -287,7 +287,7 @@ function _reset!(memory::RandDestabMemory)
     end
 end
 
-# Allocation free inverse of upper trinagular int matrix with 1 on diagonal.
+# Allocation free inverse of upper triangular int matrix with 1 on diagonal.
 function _inv!(inverse, A)
     for i in 2:size(A, 2)
         for j in 1:i-1
diff --git a/src/sumtypes.jl b/src/sumtypes.jl
index f496532b0..d06ac4a3f 100644
--- a/src/sumtypes.jl
+++ b/src/sumtypes.jl
@@ -209,7 +209,7 @@ end
 
 
 ##
-# `concrete_typeparams` annotations for the parameteric types we care about
+# `concrete_typeparams` annotations for the parametric types we care about
 ##
 
 function concrete_typeparams(t::Type{ClassicalXOR})
diff --git a/test/test_noisycircuits.jl b/test/test_noisycircuits.jl
index b1eb33c3f..83e31dc8f 100644
--- a/test/test_noisycircuits.jl
+++ b/test/test_noisycircuits.jl
@@ -272,7 +272,7 @@
             @test pet_y[true_success_stat] == 1
             @test pet_y[failure_stat] == 0
 
-            #checks probabilstic case to see if the phase of measurement anticommuting stabilizer is the same in both branches
+            #checks probabilistic case to see if the phase of measurement anticommuting stabilizer is the same in both branches
             ghz_state = S"XXX ZZI IZZ"
             reg = Register(ghz_state, [0])
             branches = applybranches(reg, sMRZ(1,1))